Belt-tightener.



PATENTED NOV i907.

E. MATTMAN. BELT TIGHTENBR.

APPLICATION FILED JANJ. 1906.

2 SHBETfi-SHEET 2..

INVENTDR. Emil JYaltm an- ATTORNEY! ITED STATES PATENT OFFICE.

UN, OF NORWOOD, OHIO, ASSIGNOR TO THE BULLOCK ELECTRIC MANULAO TUBINGGOMPAN Y, A CORPORATION OF OHIO.

BELT-TIGHTENER.

Specification of Letters Patent.

Patented Nov. 26, 1907.

Application filed January 2. 1906. Serial No. 294.081-

ion relates to belt tighteners, to belt tighteners adapted for :tionwith electric motors, al- .itpplieation is not limited to smallv highspeed motors are 1." driving machines or shaft pul- .l(lS of which arerequired to be in the speeds of the motors. Y therefore to employ apulley shaltwhich is much smaller p lley. If the difference -ders of thedriving and at, thcrewill be a small ctnitact between the motor ullcyriveu belt especially if the elt is Jon more may be consider- Wee). themotor pulley and the angle 03? and th 1. o to drive the belt at all,unless ener or idler pulley is employed le contact surface between indthe belt.

invention is to provide a 2' i eh may be adjusted to g .y migagc thebelt for any direction in which the belt may be led from the drivingoullcv ier object is to provide a belt tightn' electric motor which maybe apordinary standard motor casing. A inrt.u. r bject is to provide amotor with a belt which men, the belt ill e :n'ljusted to properlyengage position of the motor or direction in w the belt may extend fromthe motor pulley, or for either direction of rotation of the motor.

With these ends in view, consists in the details of construction andcomliinstiom uwi arrangements of parts described in tin iccificzitionand definitely set iorth in Lilit .:-i nded claims.

he load is very great the motor tightener, the idler pulley of myinvention I l l l i l l l r l l i 1 l l l l i l l 1 l l l l l g g! I l ll l l l l of the motor and the belt tightener loci;

Figure 1 is an end elevation of a motor equipped with one of my improvedbelt tighteners; Fig.

2 is an elevation of :1 port from the left of Fig. 1 Fig. 3 is a partialen:-

elevation and partial section (on a reduced scale) of the motor and belttightener, in the position shown in Fig. 1; Fig. 4 is a plan of thesame, portions being shown in. section; and Fig. 5 1s a tor with the bet in a proximately the same position as shown in 1g. 1 but with the belttightener in position for opposite rotation of the motor.

Electric motors may position relative to the driven machine or pulley,and may be mounted on the floor, side wall or ceiling. Also motors fordriving certain kinds of machines must be capable of rotating in eitherdirection. a rection of the belt isehanged, or if the'direction ofrotation. of the motor is changed, of course the position of the belttighten must be changed. As my belt tightcne capable of adjustment forcl'ianges in sition or direction of the belt, or for clian in directionof rotation of the driving pull it is especially adapted for use inconnect 1 with an electric motor, and I have therel illustrated it asapplied to a motor.

Referring to the different figures of the drawing, I have shown at 10 amotor having an end head 11 which has a bearing for shaft 12. Mounted onthe end of the shaft is a driving pulley driving belt 14. The end head11 is held to the casing by four bolts 15 which pass through lugs 16 onthe end late.

Mounted on the end hea 11 of the motor is a adacent its ends with twolugs 18 having bolt holes, the distance between which is the same as thedistance between the'equally spaced bolt holes'in the end head andeasing through which pass the I The sector plate is held to the end headof 13, about which extends the artial end elevation of a mobe placed inany (I- If the di re sector plate 17. This plate is provided holdingbolts 15. int-i:

be held firmly in piece. it is seen that the sector plate can beheld. tothe end head in any one of four diliereut positions, by replacing anytwo adjacent bolts with the olts 19. y

Mounted in the sector plate 17 adjacent I one of its ends is a bolt orstud 20, screw threaded at one end and provided with en enlargement orheed 21 at its other end. Pivotelly mounted on this stud is the sup port22 for the idler-pulley 23. This sup port consists in this case oi? twospaced, parallel, arched ei'ins 2e, each of which has at one end. abearing lug 25 through which the spindle 20 passes, and. at its otherend a bearing lug 26 for supporting the sheft or spindle 27 of theidler-pulley The supporting arms are joined togethe rnenr The innerfeces of.

their center by a cross her 28, substantially.

,L-sheped in cross section, as is shown. in

i Fig. 3.

The spindle 27 on which the idler-pulley is mounted is preferablyprovided with a. longitudinal opening 29, which forms an oil chamber,and with lateral openings 30 leading from the oil chamber to the outerbearing surface. The spindle is held in place in the lugs 26 bye washer31 and screw 32 at one end, and at the other end by the washer 33 andscrew threaded extension of the oil cup 3 L.

, Mounted on the bolt 20' between the arms 24 is a normally stationarymember -35 haw a forwardly extending arm 36, which forms on abutment forthe nessure spring, as will be described later. he member 35, has alsotwo reerwerdly extending arms or lugs 37 and 37, which have respectivelyopen-slotted, laterally extending lugs 33 and 38. The sector plate 17has on its outer face two elongated curved lugs 39 end 39, e ue-llyspaced from and on opposite sides '0 the spindleor bolt 20. The sectorplate uelly spaced is provided with two sets of e holes 40 and 40located centre 1y of the lugs 39 and 39 respectively These holes ere onarcs of circles concentric with the center.

of the spindle 20. As is shown in drawings,

a bolt'41 extends through the open slot n.

the arm 37 and through the upper hole of the series 40 in the sectorplate If it is desired to adjust the position. of the member- '35, thebolt will be withdrawn from the upper hole end inserted in e;similermenncr in either of the other holes of the same series. I Mounted1n the outer end of theerm 36 a bolt 42 having s ssmisn .rica-ihee'd ewhich is engaged by the end of e coiled spring 44. The opposite end ofthe spring engsgcs o ring or hook 45 on the end. of a bolt 46, whichpasses freely through. the cross bar 28, joining the two arms of theidler-pulley support. A nut on the screw threaded portion oi the boltlimits the downward movement of the bolt and provides it means foradjusting the tension of the spring. By means of the spring the pulleyis "held yieldin 'ly and with constant pressure against thebelt 14, themotor rotating clockwise.

.. If for any reason it is desired to change the position of theidler-pulley, the position of the arm 86, to which the spring 14.- isatti ched cun'be changed by removing the bolt from the upper hole of theseries 40, moving the 37 downward, and. loosing the some in position byins the bolt in either one of the other holes -10. it seen i let thethree positions of the srm37', corresponding to the three holes 40,provide three positions for the idler pullcy. It evident that agreoternumber of adjustments could be obtained in this manner by increasing thenumber of holes. For the three positions just described, the arm 57 andopen slot in the lug 38 are employed for locking the member 35 in itsproper position. Now, if the direction in which the belt is led from themotor pulley is changed a. considerable amount, the proper position ofthe idler pulley mny be obtained by shifting the sector plate 17 to oneof its three other positions, and if necessary, moving the bolt 41 tomother of the holes 4.0. If the, direction of rotation oi" the. motor isreversed,- the memberszz and 35 are likewise reversed to bring the otherlug l 25 end the lug 38 sdjscent to the sector plate 17. The member 35can be locked in. any desired position by means of the bolt ll, whichwill now pass through the open slot in the lug 3% and engage one ol" theholes 40. In the same manner as before the smell Ml-- justments of theidler ulley. may be ob" tinned by moving the b0 t 41 from one oi. the

holes 40 to another, while the larger adjustmcnts be obtained by "tingthe sectorplots 17 from one of its positions to another. .lhus byshifting the sector-plate 17 and the bolt 41 end by reversing themembers 22 end 1535, several different positions of the idler pulley maybe obtained for each direction of rotation oi the motor. By adjustingthe nut on the bolt 46 en indefinite number of osi tions of the idlerpulley may be obtained In'jiig. 5 the sector-plate isshifted 90 fromthe'position shown in Fig? 1 and the idler pulley s in position forcountenclockr lse movement .0 the motor, the generel direction in whichthe belt extends {Tom the pulls on the motor shaft remaining sub-s" mp4sIt is evident that many changes may be made in the details shown, and Iaim in my claims to cover all changes and modifications which do notinvolve a departure from the spirit and scope of my invention,

What I claim as new and desire to secure by Letters Patent is 1. Incombination, a shaft, an idler-pulley ad'acent said shaft, a pivoted armfor said pulley, a tension-spring having one end at tached to said arm,a normally stationary pivoted abutment to which the other end of thespring is attached, and means forlocking said abutment in differentpositions to change the position of the idler-' ulley.

In combination, a s left, an idler-pulley, a stationary support, a boltor stud attached to said support, an arm pivoted at one end to said boltor stud and carrying at its other end said idler-pulley, atension-spring attached at one end to said arm, and an acljiistaolememher also mounted on said bplt or stud and forming anahutment for theother end of the tension-spring.

3 In combination, a shaft, a support, a bolt or stud extending from saidsupport, an arm pivoted on said bolt or stud, an idlerpulley on theouter end of said'arm, a normally stationary member mounted on said.holt or stud, a spring between said arm and said stationary member forholding the idlerr pulley yieldin gly against the belt, and means forlocking said normally stationary member to said support in variouspositions of ad justment.

4. In combination, an electric motor, a

plate mounted on said motor, astud e'xtend-' mg from said plate, an.a.rm pivoted to said stud, an idler-pulley mounted on the outer end ofsaid arm, a member mounted on said Stud, 8. spring between the arm andsaid member, and means for locking said member to said plate in variouspositions of adjustmerit.

In combination, an electric motor hav no; an end head, a sector-platemounted on two adjacent bolts passing through said end head, a studextending from said plate, an idlcnpulley, a support therefor comprisingan arm pivoted to said stud, a tension springabutment mounted on saidstud, a tension s )ring between said pulley support and said a utment,and means for adjusting the posi tion of said abutment.

6. in combination, on electric motor having a field-frame and anend-head, a pluralit of bolts for attaching said end-head to the ame, asector-plate mounted on two of said bolts, a stud on said plate, anidler-pub ley, a support therefor mounted on said stud, a springabutment also mounted on said stud, a spring bctu een saidpulley-support and said abutment, and means for adjusting said abutment.

7. In combination, an electric motor'having a field-frame and an en'.l-head a pinrality of bolts .forattaching said end-head to the frame, asectorlate mounted on two adjacentbolts, a stiu on said plate, anidlerpullev, a support therefor pivoted to said stud, a spring-abutmentalso mounted on said stud, a spring between the support and theabutment, said plate being provided with a set of holes, and a boltadapted to engage any one of said holes and said abutment to hold thelatter in position.

8. In combination, an electric motor, a plate mounted on the endthereof, a stud on said plate, an idler-pulley, a support thereformounted on said stud, a member also mounted on said stud, and having aforwardly extending arm and two rearwardl extending arms, a springbetween the pulley-sup ort and forwardly extending arm, said plate 1aving on each side of the stud a set of spaced holes, and a bolt ada itedto enga e one of said rearwardly exten ing arms and a hole in one ofsaid sets when the pulley is in one position, and adapted to engage theother of said rearwardly extending arms and a hole of the other set whenthe position of the pulley and support is reversed on said stud.

In testimony whereof I affix my signature, in the presence of twowitnesses.

EMIL MATTMAN.

Witnesses:

Fnnn J. KINSEY,

ARTHUR F. KEVIS.

